10 Gastroduodenal Diseases
• Greater curvature, lesser curvature, inferior and superior borders (respectively) of the voluminous body of the stomach
• Pyloric region
• Receptive relaxation and accommodation occur in the proximal 1/3 of the stomach, with swallowing and entry of food.
• True peristalsis occurs in the distal 2/3, with waves of contraction driving the contents back and forth between the body and antrum (trituration).
• Small amounts of triturated stomach contents pass through the pylorus with successive peristaltic waves.
Oxyntic glands in the fundus and body
• Superior (first) part
Ampulla (cap)—first 2 cm—bears a mesentery, the hepatoduodenal ligament, part of the lesser omentum.
• Descending (second) part
Receives the outflow from bile and pancreatic ducts via the hepatopancreatic ampulla (Vater) through the greater duodenal papilla (Vater)
• Horizontal (third) part
• Lamina propria: contains Peyer’s patches (lymphoid aggregations with B cells in germinal centers and T cell in interfollicular zones)